Which arrhythmia is commonly associated with sudden death during a myocardial infarction?

Ventricular fibrillation is a life-threatening arrhythmia that is often associated with sudden cardiac arrest, particularly during a myocardial infarction. During a myocardial infarction, the heart muscle can become ischemic, leading to electrical instability. This instability can precipitate arrhythmias, with ventricular fibrillation being a common consequence. When the ventricles experience chaotic electrical activity, they fail to contract effectively, which hampers the heart’s ability to pump blood and can result in loss of consciousness and sudden death if not treated immediately.

In the context of a myocardial infarction, the damage to the cardiac tissue and the physiological changes that occur can lead to a higher risk of arrhythmias. Ventricular fibrillation is especially dangerous because it can occur suddenly and without warning, often leading to abrupt cardiovascular collapse. Immediate defibrillation is crucial in such cases to restore normal rhythm and prevent death.

Other arrhythmias, while abnormal, do not present the same immediate risk of sudden death in this context. For example, atrial flutter is often less life-threatening and can be managed more easily. Sinus bradycardia may occur due to ischemia but typically does not result in sudden death. Ventricular tachycardia can be serious,